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ATtiny13 – two tone alarm

This is a simple and easy to build two-tone alarm that uses ATtiny13 to produce sound effects. Note that with little modifications the project can be easily utilized for many applications, in circuits where a double tone alarm may be required. Project’s code has been designed to make possible extend a list of two-tone sound effects. It already contains some example ringtones. Feel free to create your own tone combinations. Have fun, and please, don’t forget to share your work in the comment! As always, complete code is available on Github, click here.

5 thoughts on “ATtiny13 – two tone alarm”

Hi, the output signal comes directly from ATtiny13 I/O, so the alarm is not very loud. However, loud enough to hear it in the next room. If you need little louder alarm, then signal amplifier is required.

Probably yes but I’m sure it need some work to port it to Arduino. However, for Arduino platforms there is a sort of libraries able to make a sound what would be easier to implement if you’re starting your adventure with C.